Loans Receivable and Allowance for Credit Losses - Aging Analysis on Loans Held-for-Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 99,526	$ 93,181
Loans held-for-investment	48,202,430	41,693,781
Commercial Lending
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	73,841	68,965
Loans held-for-investment	34,780,453	30,327,746
Commercial Lending | C&I
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	50,428	59,023
Loans held-for-investment	15,711,095	14,150,608
Commercial Lending | CRE
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	23,244	9,498
Loans held-for-investment	13,857,870	12,155,047
Commercial Lending | Residential loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	169	444
Loans held-for-investment	4,573,068	3,675,605
Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Loans held-for-investment	638,420	346,486
Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	23,413	9,942
Loans held-for-investment	19,069,358	16,177,138
Consumer Lending
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	25,685	24,216
Loans held-for-investment	13,421,977	11,366,035
Consumer Lending | Residential loan | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	14,240	15,720
Loans held-for-investment	11,223,027	9,093,702
Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	11,346	8,444
Loans held-for-investment	2,122,655	2,144,821
Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	25,586	24,164
Loans held-for-investment	13,345,682	11,238,523
Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	99	52
Loans held-for-investment	76,295	127,512
Current Accruing Loans
Nonaccrual and Past Due Loans
Loans held-for-investment	48,040,733	41,555,745
Current Accruing Loans | Commercial Lending
Nonaccrual and Past Due Loans
Loans held-for-investment	34,682,072	30,238,648
Current Accruing Loans | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Loans held-for-investment	15,651,312	14,080,516
Current Accruing Loans | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Loans held-for-investment	13,820,441	12,141,827
Current Accruing Loans | Commercial Lending | Residential loan | Multifamily
Nonaccrual and Past Due Loans
Loans held-for-investment	4,571,899	3,669,819
Current Accruing Loans | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Loans held-for-investment	638,420	346,486
Current Accruing Loans | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Loans held-for-investment	19,030,760	16,158,132
Current Accruing Loans | Consumer Lending
Nonaccrual and Past Due Loans
Loans held-for-investment	13,358,661	11,317,097
Current Accruing Loans | Consumer Lending | Residential loan | Single-family
Nonaccrual and Past Due Loans
Loans held-for-investment	11,183,134	9,059,222
Current Accruing Loans | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Loans held-for-investment	2,102,523	2,130,523
Current Accruing Loans | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Loans held-for-investment	13,285,657	11,189,745
Current Accruing Loans | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Loans held-for-investment	73,004	127,352
Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Loans held-for-investment	42,677	31,091
Accruing Loans 30-59  Days Past Due | Commercial Lending
Nonaccrual and Past Due Loans
Loans held-for-investment	21,345	16,025
Accruing Loans 30-59  Days Past Due | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Loans held-for-investment	6,482	6,983
Accruing Loans 30-59  Days Past Due | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Loans held-for-investment	14,185	3,722
Accruing Loans 30-59  Days Past Due | Commercial Lending | Residential loan | Multifamily
Nonaccrual and Past Due Loans
Loans held-for-investment	678	5,320
Accruing Loans 30-59  Days Past Due | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Loans held-for-investment	0	0
Accruing Loans 30-59  Days Past Due | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Loans held-for-investment	14,863	9,042
Accruing Loans 30-59  Days Past Due | Consumer Lending
Nonaccrual and Past Due Loans
Loans held-for-investment	21,332	15,066
Accruing Loans 30-59  Days Past Due | Consumer Lending | Residential loan | Single-family
Nonaccrual and Past Due Loans
Loans held-for-investment	13,523	10,191
Accruing Loans 30-59  Days Past Due | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Loans held-for-investment	7,700	4,776
Accruing Loans 30-59  Days Past Due | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Loans held-for-investment	21,223	14,967
Accruing Loans 30-59  Days Past Due | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Loans held-for-investment	109	99
Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Loans held-for-investment	19,494	13,764
Accruing Loans 60-89  Days Past Due | Commercial Lending
Nonaccrual and Past Due Loans
Loans held-for-investment	3,195	4,108
Accruing Loans 60-89  Days Past Due | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Loans held-for-investment	2,873	4,086
Accruing Loans 60-89  Days Past Due | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Loans held-for-investment	0	0
Accruing Loans 60-89  Days Past Due | Commercial Lending | Residential loan | Multifamily
Nonaccrual and Past Due Loans
Loans held-for-investment	322	22
Accruing Loans 60-89  Days Past Due | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Loans held-for-investment	0	0
Accruing Loans 60-89  Days Past Due | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Loans held-for-investment	322	22
Accruing Loans 60-89  Days Past Due | Consumer Lending
Nonaccrual and Past Due Loans
Loans held-for-investment	16,299	9,656
Accruing Loans 60-89  Days Past Due | Consumer Lending | Residential loan | Single-family
Nonaccrual and Past Due Loans
Loans held-for-investment	12,130	8,569
Accruing Loans 60-89  Days Past Due | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Loans held-for-investment	1,086	1,078
Accruing Loans 60-89  Days Past Due | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Loans held-for-investment	13,216	9,647
Accruing Loans 60-89  Days Past Due | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Loans held-for-investment	3,083	9
Total Accruing Past Due Loans
Nonaccrual and Past Due Loans
Loans held-for-investment	62,171	44,855
Total Accruing Past Due Loans | Commercial Lending
Nonaccrual and Past Due Loans
Loans held-for-investment	24,540	20,133
Total Accruing Past Due Loans | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Loans held-for-investment	9,355	11,069
Total Accruing Past Due Loans | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Loans held-for-investment	14,185	3,722
Total Accruing Past Due Loans | Commercial Lending | Residential loan | Multifamily
Nonaccrual and Past Due Loans
Loans held-for-investment	1,000	5,342
Total Accruing Past Due Loans | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Loans held-for-investment	0	0
Total Accruing Past Due Loans | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Loans held-for-investment	15,185	9,064
Total Accruing Past Due Loans | Consumer Lending
Nonaccrual and Past Due Loans
Loans held-for-investment	37,631	24,722
Total Accruing Past Due Loans | Consumer Lending | Residential loan | Single-family
Nonaccrual and Past Due Loans
Loans held-for-investment	25,653	18,760
Total Accruing Past Due Loans | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Loans held-for-investment	8,786	5,854
Total Accruing Past Due Loans | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Loans held-for-investment	34,439	24,614
Total Accruing Past Due Loans | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Loans held-for-investment	$ 3,192	$ 108